The Cal-Van ToolsUniversal Brake Bleeder Adapter, No. 24630CV, features powder-coated adjustable arms that move vertically and horizontally to securely fit on any brake fluid reservoir with an opening diameter of 1"-2.76". The adapter is compatible with both disc and drum brake systems and has a 90-degree rotating coupler for easy access. It includes a conical rubber seal made from EPDM rubber and a knurled adjusting collar that provides an air-tight seal. The adapter has a maximum holding pressure of 50 psi.